Color photography



Sept. 1, 1925. Q 1,551,611

G. LLENDORFF ET AL COLOR PHOTOGRAPHY Filed Nov. 4. 1924 @dal R35 L A7-f#a4 l|||||||||||||||||||||||||||||||||||||||||| Fed/WWW a "I I l /PeaVd/Qe/ovs/'/'Ve ummm-Emmimmmnm l l I Screen 5 fm1/.avian l&\\\\\\\\\\\\\\\\\\\\\\\w Green /r/Wrsr l Green fa/ae ,oas/'fire ScreenEma/nba Emu/Jion Patented Sept. 1, 1925.

y 1,551,611 PATENT oiFFlcs. A

GERHARD OLLENDOBFF, 0F BERLIN-WILIEBSDOBF, AND AUGUST'TANZEI, l0FY m-Lm-Tnnr'row, amm, assumons To nennt 1-: 1 rumxmrrcn, or 13mm, GERMANY.

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`Application' led Iovember 4, 19M. Serial lo. 747,828.

To all whom 'it may concern.'

j Be it known that We, Galdiano OLLEN nonrr' and AUGUST TANZEN, citizensof the German Republic, residing at Berlin-Wilmersdorf, Germany, andBerlin-Treptow, Germany, have invented certain new and usefulImprovements in Color Photography, of which the following is aspecification.

This invention 'relates to the art of color photography.

In .methods known as polychromatic screen plate processes, for producingcolor photographs a considerable portion of light incident on theplatepor film is absorbed by the rulings, grains or the like in thescreen plate and thus the effective sensitivity ofthe" plate or film isdiminished in proportion.-

This process is, therefore, not welly suited for such short exposures asare necessary, from the stand point of optical considerations, for Vthephotography of quickly moving objects.

For this reason,especially inthe production of colored cinematographicpictures, it is practice toresort to the use ofmonochromatic pictures,such as are obtained by exposing highly sensitized panchromatic fplatesor films to the action of image-formlng devices in conjunction withappropriate light filters of the primary colors, as is Well understood,which pictures are then combined in well known manner to produce thecomposite color picture.

One method, according to which the 'three constituent color valuepositives are projected simultaneously,'so as to be in exact opticalsuperposition upon the screen,

usually requires complicated apparatus.

Another. method, according to which the color value positives arelsuccessively projected, necessitates a relatively high speed ofthe filmwhich is thereby subjected to undue strains.

It is the object of the present invention to Fig. 1 represents a coloredobject to be photographed;

Figs. 2, 3 and 4 represent three color value positives made therefrom;and

j Figs. 5, 6 and 7 the production of a composite color picture from thethree color value positives shown in Figs. 2, 3 and 4.

The three color value n schematically represente in Figs. 2, 3 and 4 maybe made in the usual manner and by any suitable apparatus well knowninthe art. For the sake of illustration it may be assumed that a.represents a. positive that has been printed from a negative which wasproduced by a. camera and a red light filter. imilarly, positives b andc may be assumed :mummia itives a, b and c to have been produced inidentical manner from negatives made with greenand blue filters,respectively.

The three color value positives are then photographed upon apolychromatic plate or film P, i. Ae. the pictures represented byappropriately illuminated color value positives as made in three colorprocesses are superposed upon each other on the polychromatic screen,separately or simultaneously in any suitable manner.

Thisrmaybe done, as indicated in Figs. 5, 6 and 7 by contact printing.The three color value positives a, b and c are succsively brought intoposition upon a polychromatic plate or film P and illuminated by asuitable light source L in conjunction with the appropriate lightfilters al, b1 and c1, respectively.

While contact printing' has been specifically referred to as one mode ofproducing the composite colored picture upon a polychromatic screen, anyother modes whereby appropriately illuminated color value positives maybe photographed in superposition upon a polychromatic screen come thescope of the invention.

It is thus possible, by the present invention, to produce uniformlycolored pictures of excellent color qualities which may be projected bysimple projecting apparatus. Means for making accurate and pains-takingadjustments necessary for effecting exact superposition need be rovidedonly once and any large number o? colored films can be made thereby.Moreover, the accurate and tedious work necessary can be done atconvenience and at ease.

We claim,-

1. The method of producing pictures which consists in malng color valueositives of an object and then photograp the color value positives, eachilluminated by monochromatic light corresponding to in superposition u na polychromatic screen provided on lts opposite side with a sensitiveemulsion.

2. In the art of color photography, the step which consists inphotogrghing color value positives, each illuminat by monochromaticlight corresponding to it in superposition upon a polychromatic screenprovided on its opposite side with a. sensitive emulsion.

3. In the art of color l1 tography, the steps which consist in mingcolor value positives of an object and then superposing pictures of theobject as represented by the different color value positives, eachilluminated by monochromatic light corresponding to it upon a.polychromatic screen provided on its opposite side with a. sensitiveemulsion.

4. In the art of color photography, the

step which consists in super osing pictures of an object as representeby different color value positives thereof, each illuminated bymonochromatic light corresponding to it upon a polychromatie screenprovided at its opposite side with a sensitive emulsion.

5. Method of producing color photographs, which consists inphotographing the composite ei'ects produced by color value positives,each illuminated b mono-A chromatic light corresponding to 1t, upon apolychromatic screen provided on its opposite side with a sensitiveemulsion.

6. Method of producing color photographs which conslsts in making colorvalue positives of an object and then printing the color value positivesin succession, each by monochromatic light corresponding to it, upon thesame surface unit of a polychromatic screen provided on its oppositeside with a sensitive emulsion.

In testimony whereof we aix our signatures.

GERHARD OLLENDORFF. AUGUST TANZEN.

